Doctor for calendering-machines.



T. E. WARREN.

DOGTOB FOR CALENDERING" MACHINES.

MPL ICATION FILED ARR. 21. 1913.

Patent-ed June 29, 1915.

A WITNESSES Ill/MENTOR 7 7770mm l l/a/wen T. E. WARREN. DOCTOR FOR IALENDERING MACHINES.

SHEET 2.

N r APPLICATION FILED APR'2U1913. 92,,

Patentd 111116 29 4 SHEETS nm mm W f 5 a m T I ATTORNEYS T. E. WARREN.

DOCTOR FOR CALENDERING MACHINES.

APPLICATION FI LED APR. 21, 1913- Patented June 29 1915. SHEET 3.

4 SHEETS rll WITNESSES IWTORI'JEVS T. E.-WARREN.

oocron rogcmmnznme MACHINES.

Patented June 29, 1915.

4 SHEETS-SHEET 4.

APPLICATION FILD APR. 2!. !913.

I LEQQ SUQO v Thonfasli' Warrwz I ATTORNEYS.

THOMAS E. WARREN, O F TIGONDEROGA, NEW YORK.

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Specification of Letters Patent.

Patented June 29, rats.

. Application filed April 21, 1913. Serial No. 762,540.

' v To all whom iamay concern:

Be it known that I, THOMAS E. WARREN, a citizen 'of the United States, and a resident of Ticonderoga, in the county of Essex and State of New York, have invented a new and Improved Doctor for Calendering-Machines, of which the following'is a full, clear, and exact description.

The invention relates to paper making machinery, and more particularly to calenders of the stack roll type. I

The object of the invention is to provide an improved form of doctor mechanism for use in a balendering machinewith which a more perfect doctoring eflectis produced though the pressure of the doctors on the corresponding rolls is relatively light and with which greater convenience in operation is secured.

, One of the features of the invention re sides inthe provision of means whereby all of a plurality of doctors may be moved simultaneously into or out of operative position, or to adjust the pressure thereof on the coacting rolls, and whereby any one of the doctors may be adjusted individually to regulate its pressure on the coacting roll in dependently ofthe others. To this end a single operating mechanism is provided for moving all of the doctors together, and the individual connections from this mechanism to the several doctors are each constructed to permit of individual adjustment. These individual connections also have yielding devices'combined therewith through which the movements of the operating mechanism are transmitted to the doctors. As a result of this construction, all of the'doctors may be moved to the working position or to. an inoperative position together, and when in the working position their pressure on the rolls may be increased or diminished together and the several doctors may be individually adjusted so that the pressure thereof may be equalized. v

The invention also involves the" use of a doctor-blade in the formof 'a'thin flexible strip of metal by which 'a yielding and elastic contact with the coacting'roll is produced, whereby the doctoring effect is made more perfect with relatively light pressure of the doctor on the roll. Also, if the rolls expand unevenly due to heating, such a flexible doctor will conform more readily to the face of the roll with little if any'added pressureover the heated or expanded area. Another advantage resulting from the use of such a flexible doctor blademounted on a metallic bar extending parallel and adjacent to the corresponding roll is that it permits of arranging the operating mechanism for the several doctors at one side only of the machine, the torsion of the supporting bars for the doctors serving to hold the latter in proper contact with the rolls. Furthermore, such thin metallic doctor blades are inexpensive, may be readily removed when worn, are more ieasilyfitted to the corresponding rolls and are highly eiiicient in the performance of their functions. I

The features of the invention will be bet ter understood by reference to the following description in connection with the accompanying drawings, which show the preferred embodiment of the invention.

Figure 1 is a sectional side elevation of the doctors in contacting position with the stack of rolls of a calendaring machine; Fig. 2 is a front elevation of the same, parts being in section; Fig. 3 is a front elevation of one of the doctors; Fig. 4 is an enlarged sectional side elevation ofthe same; Fig. 5 is an enlarged sectional plan View of one of the coupling rods and its connection with the manually-controlled rocking shaft; Fig. 6 is a sectional front elevation of the same; Fig. 7 is an enlarged sectional side elevation of one of the doctors in contact with a roll and showing a yielding connection with the coupling rod; Fig. 8" is a front elevation of the same; and Fig. 9 is a sectional side elevation of a doctor having another. form of yielding connection with the coupling rod.

The calendering machine is mounted on a suitably constructed frame A, and is provided with the-usual top and bottom rolls B, B and the intermediate rolls B the endless web of paper G passing over the top roll B and then between the successive rolls, to finally leave the machine after its passage between the bottom roll B and the next roll B above, as plainly indicated in Fig. l. Onthe opposite sides of the series of rolls B, B are arranged sets of doctors D, the doctors of each set engaging alternate rolls to provide a doctor for each roll, B, B and the doctors are provided at their ends with trunnions 'E journaled in brackets F adjustably-"secured in vertical guideways G fixed on the main frame A. Each of the brackets F is preferably made in two parts F, E3, of which the member F is adj ustably 10 are attached to the main frame A and the securedby bolts F to the'member F and carries the trunnions E, and the other member F is adjustably secured by 'bolts'F" to the guideway G (see-Figs'7 and 8). One of the trunnions E of each doctor is provided with an outwardlyextending arm H having a slotted portion H engaged by a pin I secured to a vertically-disposed coupling rod J mounted to slide up and down in suitable bearings J and J of which the bearings J bearings 2 are secured to the guideway The two coupling rods J on opposite sides of the doctors 1'); are pivotally connected near their lower ends by pins 1 with the slotted ends of crank arms K (see Figs. 5 .and 6) arranged on a rock shaft K journaled in suitable bearings K attached to the main frame A. .One 'end of the rock' shaft K is provided with a suitable handle L under-the control of the operator for rocking the shaft K whenever it is desired to simultaneously swing all the doctors D into or out of engagement'with the peripheral faces of the stack of rolls. The handle L is adapted to be locked to a segment N so as to hold the rock shaft K in the position into which it is turned." .It is understood that when the rock shaft K is unlocked and the handle L is swung to the right to rock the shaft K in the same direction then the crank arms K swingdownwarcl and in arms doing so impart a downward sliding motion to the coupling rods J so that the pinsl impart a downward swinging motion to the nions E and thus move the doctors into contact with the peripheral faces of the rolls. When the handle L is swung to the left the shaft K is ocked in a reverse direction so that-the crank arms K impart an upward sliding. motion to the coupling arms J whereby the, rods H are swung upwardand the doctors'D are rocked to carry them out of engagement'with the: rolls. Thus by the arrangement described, the 'operator can quickly move the. several doctors into or fout.

of peripheral engagement with the rolls.

The detail construction of each doctor D is as follows, special reference being had to Figs. 3 and i: The doctor blade D is made and the heel portion of the blade D" is of very thin, flexible material, preferably steel or a suitable composition of bronze,

clamped betweena doctor bar D and a topclamping plate D. This clamping plate is fastened in position or; the doctor bar D byboltsD which are spaced a short distance away from the heel of the doctor blade 1), so that the latter can be readily adjusted on loosening the bolts D to compensate for i wear and to insure a proper contact of the outer projecting edge with the peripheral surface of the corresponding-roll. {The doctor bar D is preferably the form of H to rock the doctors D on their truns' an angle iron, the top member of which supports the doctor blade D andthe-vertical member of which cal if'is @at its; ends the trunnions E provided with shoulders E" on which the arms H are secured by set screws H as plainly indicated in'Fig. 7,

spring 0* bears at one end on the top of the block-:0 and at its yther end against-a washerQ resting against the nuts 0 ;-thus a-yielding connection is madebet-weenlthe arms Hand link G on whichscrew nuts 0 and 03. A- is coiled around the link ,0 i-andthe link 0" to allow of holding the doctor blade D with more or-less force 'in-contact V with the peripheral-faceofthe corresponding-roll; it being understood that the tension of the spring Otpan be increased or diminished by screwing down or screwing up the nuts 0 on the link 0. Thenuts 0 form adjustable stops for, limiting -,a= possible downward swinging 'motion of the rod H while the dpfltorblade D is in ,contact with the corresponding roll, It will also be noticed that by the arrangement described thevdoctor blade I); remains in contact with its roll. in the event'of. the roll jumping due to awad in the-web of paper passing be tween the corresponding rolls,

The yielding connection between the arm follows: On theiouter vend of the arm H is pivoted a memberl li hav ing an exterior screw thread Pv on which screws a sleeve I fulcrumed on thepin I fat tache'd to the corresponding coupling rod J ;A spring I is coiled on the rod P within the sleeVeP and the upper end of the spring abuts against a nut P attached to the upper end 0 the rod P .The lower end'of the spring P rests on the bottom of the slecve P By the arrangement. described, the tensionof the'spring I? can be readilyl'adjusted'by screwing the sleeveP fartherfup or fartherdown on, the threaded endof the member P.

It will also be noticed by the arrangement described that adjustable and yielding-con- H and the pinI' (shown in ,Fig. 9) is as y neetion is made between. the arm H and the pin I to hold the doctor bladeDfwith the:

s red force in contact with theeorresponding roll, andto hold the doctor blade in con tactiwith} the roll 'f case 'vthe latter should jump,,asypreviously explained. g ,V

V bottom, roll B", is provided at ends with trunnions R jourlialed in brackets F similar to the brackets- I? but secured to the main frame A. (see Fig.

The docto Q for the I l) One of the trunnions R is provided with iulcrumed at, U on the mainframe A and having pivotal connection with'a pin 1 on the-lower. end of one of the coupling rods J-.

A spring T? is coiled on the upper end of the rod. T and rests with its lower end on the ,block T while the upper end of the spring abuts against a nut T screwing on the upper end of the rod T. By the arrangement described a yielding connection is had between the lever U and the arm S of the doctor Q to hold the doctor with more or less force in engagement with the. peripheral face of the lower roll B.. It is understood that the tension of the spring T can beincreased 0rdiminished by correspond-- ingly adjusting the nut Tt' By this constructiomthe upward movement ofthe coupling rods J will cause a downward-.move

. ment of the link T so that the doctors coacting with the rollers B .will be turned and the doctor coacting with the roller B will be turned angularly on its pivots in the opposite direction. I

With the construction herein illustrated and described all of the doctors coacting with the set of calender rolls may be moved simultaneously into and. out'of operative position, and when in operative position they may be moved simultaneously so as to in-' crease or decrease the pressure thereof upon the coacting rolls. A single operating mechanism efi'ects thesimultaneous move ment of. all of the-doctors, and this operating mechanism may be mounted in any convenient positionupon the frame of the ma chine. The operating mechanism may be provided with a "look if desired, such, for

instance, as a ratchet and pawl, whereby when the doctors have been subjected to the desired degree of pressure, they may be held in the position formaintaining their pressure. It will be noted, however, that the individual connections fromthe several doc- 'common operating mechanism also have yieldingly devices therein, so that any doctor may move independently of the others and of the operating mechanism when such independent movement is necessary, as, for instance, when the coacting roller is moved under.

bodily by a wad in'the paper passing there- With the form of doctor blades herein shown and described, consisting of long, thin, flexible sheet metal strips, any doctor which has become Worn may be readilyremoved and replaced, the work of fitting a new doctor in position for proper co -action with its roller may be readily accomplished, and if the roller heats and expands unevenly, the blade will shape itself to conform to the roller.- Another advantage resulting from the use of doctor blades of the character herein shown mounted upon metallic supporting rods extending parallel and adjacent to the corresponding rollers, is/ that with this construction an operating mechanism may be employed which is located whplly at one side of the machine and which is connected to the several supports for the doctors at one end thereof only. This conduces to greater convenience in the operation off/the machine and a good doc-.

toring effect is obtained throughout the length of the rollers since the doctor blades will be held in substantially uniform con- Hiirving thus described my invention, I

claim as new and desire to secure by Letters Patent? 1. In a calendering machine, the combination of a plurality of rolls, a doctor bar parallel and adjacent to each roll, a doctor mounted on each bar, trunnions at the ends of eachbar, bearings for the trunnions, arms secured to the bars and an operating mechanism connected to all of said arms for simultaneously rocking the bars and the doc-- tors thereon in said bearings to carry the doctors into and out of co-action with their corresponding rolls; substantially described.

2. In a calendering machine, the combination of a plurality of rolls, ,a doctor bar parallel and adjacent to each roll, a thin, flexible metallic doctor on each doctor bar,

a clamping member secured to each doctor bar to hold the doctor thereon in position,

trunnions' on the ends ofsaid bars, bearings for said trunnions, an arm on one end of each of the bars, and a single operating mechanism for all of said bars connected to all of said LIIIIS\ for simultaneously rocking the bars in their bearings, said doctor bars serving to hold the doctors in contact with the coacting rolls with substantially equal pressure throughout the length of the doctors; substantially as described.

3. In a calendering machine, the combination of a plurality of rolls, sets of rocking doctors, one set on each side of the series of rolls, and each doctor having a blade adapted to bear at one edge on the peripheral face of the corresponding roll, arms extending from the doctors, coupling rods movable from the doctors, vertically disposed coupling r'ods, bearings in which the said con pling rods are mounted toslide up and down, and connections between the said arms and the said coupling rods. l

14.. In a calendering machine, a set of coacting rolls arranged in vertical a1ine ment, a pluralityof rocking doctors each coacting with one of said rolls, and a single operating mechanism connected to all of said doctors for rocking them simultaneously, said mechanism being arranged to rock the doctor coacting with the roll at v the end of the series in one direction and to rock all of the other doctors in the opposite.

direction; substantially as described. A

' 15. In a calendering machine, the combination with a calendering roll, of a thin flexible doctor blade therefor, a rocking bar carrying the blade, and an operating device connected to one end only" of the bar and thereby applying the doctorblade to the roll with a force due to the torsional strain set up in the bar from one end thereof.

16. In a calendering machine, the combination of a roll, a doctor bar of angular cross-section extending parallel and adjacent to. the roll, journals in which the ends, of the bar are pivotally mounted, a thin, flat, flexible doctor, mounted on the bar, and an operating device connected to one end only I frames, a set ofcalendering rolls extending of said bar for rocking the bar to carry the doctor into and out of coaction with the roll.

'17. In a calendering machine, the combination of a roll, a doctor bar extending parallel and adjacent to the roll and capable of a limited amount of torsional movement, journals in which the ends of the bar are pivotally mounted, a thin, flexible doctor mounted on the bar, and an. operating de vice connected to one end only of said bar for rocking the bar to carry the doctor into and out of coaction with the roll, the torsion f of the bar serving to hold the doctorjin coaction with the rollthroughout the length of the roll.

'18. In a calendering machine, the combi between and journaled in said frames, a doctor bar extending parallel to each roll and having its ends pivotally mountedon said frames, a thin, flexible doctor on'each bar adapted to coact with the adjacent roll,

a laterally-extending arm on one end of each bar, all of the several arms being adjacent to the same" frame member, and

single operating mechanism connected to all of said arms. QOF'In a calendering machine, the combination of a plurality of rolls, doctor bars pivotally mounted parallel and adjacent to the rolls, thin, flexible doctors mounted on the bars, an operating device connected to all of the bars for'rocking them simultaneously, and a retainer coacting with the op crating device for-holding that device and j the doctors wmoved thereby in any desired position, whereby the doctors may be held out of contact with their respective rollers -.or in contact therewith with any desired degree of pressure.

'21. In a calendering machine, the combi' nation of a plurality of rolls doctor bars pivotally mounted parallel and adjacent to the rolls, flexible doctors mounted on the bars, a single operating device common. to all of the bars, individual connections from said device to each bar having adjustable devices therein, and a retainer coacting with the operating device for holding that device and the doctors moved thereby in any desiredposition, whereby the doctors may be held out of contact with their respective rollers or in contact therewith with any desired degree of pressure.

22. In a calendering machine, the combination of a plurality of rolls. doctor bars pivotally mounted parallel and adjacent to the rolls, flexible doctors mounted on the 'bars, a single operating device common to all of the bars, individual yielding connections between the operating device and the several bars, and a retainer coacting with the operating device for holding that device and the doctors movedthereby in de sired position, whereby the doctorsmay be held out of engagement with their respective rolls or in engagement therewith witlran-y desired degree of pressure. t

In testimony whereof I have signed my name to this specification in the presence 0t two subscribing witnesses.

THOMAS E. WARREN. -Witness'es:

C. F. .HUNT, I. C. NEWTON. 

